Difference between revisions of "Velocity-azimuth display"

From Glossary of Meteorology
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<div class="definition"><div class="short_definition">(Abbreviated VAD.) A [[radar]] display of the [[mean Doppler velocity]] at  a given [[range]] as a function of the [[azimuth]] angle as the radar antenna rotates through (usually)  a complete 360&#x000b0; azimuth scan at a constant [[elevation angle]].</div><br/> <div class="paragraph">[[Harmonic analysis]] of a VAD is used to determine spatially averaged kinematic properties of  the [[wind field]], namely, the [[wind speed]] and [[direction]], the [[horizontal divergence]], the horizontal  [[deformation]], and the orientation of the [[axis of dilatation]]. By repeating this process at many  elevation angles or ranges, a [[vertical profile]] of the horizontal [[wind]] ([[VAD wind profile]]) above  the radar site can be constructed.</div><br/> </div>
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<div class="definition"><div class="short_definition">(Abbreviated VAD.) A [[radar]] display of the [[mean Doppler velocity]] at  a given [[range]] as a function of the [[azimuth]] angle as the radar antenna rotates through (usually)  a complete 360&#x000b0; azimuth scan at a constant [[elevation angle]].</div><br/> <div class="paragraph">[[harmonic analysis|Harmonic analysis]] of a VAD is used to determine spatially averaged kinematic properties of  the [[wind field]], namely, the [[wind speed]] and [[wind direction|direction]], the [[horizontal divergence]], the horizontal  [[deformation]], and the orientation of the [[axis of dilatation]]. By repeating this process at many  elevation angles or ranges, a [[vertical profile]] of the horizontal [[wind]] ([[VAD wind profile]]) above  the radar site can be constructed.</div><br/> </div>
 
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Latest revision as of 17:11, 25 April 2012



velocity–azimuth display

(Abbreviated VAD.) A radar display of the mean Doppler velocity at a given range as a function of the azimuth angle as the radar antenna rotates through (usually) a complete 360° azimuth scan at a constant elevation angle.

Harmonic analysis of a VAD is used to determine spatially averaged kinematic properties of the wind field, namely, the wind speed and direction, the horizontal divergence, the horizontal deformation, and the orientation of the axis of dilatation. By repeating this process at many elevation angles or ranges, a vertical profile of the horizontal wind (VAD wind profile) above the radar site can be constructed.